We did Universal in July and were very glad we got the express pass. We were able to get into all the major attractions. You can save about $10 dollars if you buy the passes at the park. They are sold just inside the entrance for $25.
A word of caution they only sell a limited number of express passes at the park. If they are sold out when you get there you will have to fight the lines. We paid the premium and booked express with NCL.